Bohyun Kim1,2, Jae Ho Byun3, Hyoung Jung Kim1, Hyung Jin Won1, So Yeon Kim1, Yong Moon Shin1, Pyo Nyun Kim1. 1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Asanbyeongwon-gil 86, Songpa-Gu, Seoul, 138-736, Korea. 2. Department of Radiology, Ajou University School of Medicine, 164, World cup-ro, Yeongtong-gu, Suwon, 443-380, Korea. 3. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Asanbyeongwon-gil 86, Songpa-Gu, Seoul, 138-736, Korea. jhbyun@amc.seoul.kr.
Abstract
OBJECTIVES: To compare the enhancement patterns and prevalence of pseudo-washout between rapidly and slowly enhancing hepatic haemangiomas on gadoxetate disodium-enhanced MRI in patients with chronic liver disease (CLD) and healthy liver (HL). METHODS: On gadoxetate disodium-enhanced MRI, the extent of intralesional arterial enhancement >50 % and ≤ 50 % of lesions was defined as rapid and slow enhancement, respectively. The enhancement patterns and presence of pseudo-washout during the portal venous phase (PVP) and transitional phase (TP) of 74 hepatic haemangiomas were retrospectively evaluated in the CLD and HL groups. Sequential changes of signal-to-noise ratio (SNR) were measured in unenhanced phase, PVP and TP. RESULTS: Irrespective of hepatic health status, pseudo-washout in TP was significantly more common in the rapidly enhancing haemangiomas (p ≤ 0.026). In both groups, rapidly enhancing haemangiomas showed complete or progressive incomplete enhancement in PVP, which either lasted or transformed to pseudo-washout in TP, whereas slowly enhancing haemangiomas showed progressive incomplete enhancement in PVP and TP. SNR of hepatic parenchyma continued to rise until TP, whereas that of portal vein and haemangioma falls in TP. CONCLUSIONS: Regardless of CLD, pseudo-washout in TP was more common in rapidly than in slowly enhancing haemangiomas, with enhancement patterns differing in the two subgroups. KEY POINTS: On gadoxetate disodium-enhanced MRI, some hepatic haemangiomas show pseudo-washout in transitional phase. Regardless of chronic liver disease, pseudo-washout is significantly more common in rapidly enhancing haemangiomas. Rapidly enhancing haemangiomas show complete or progressive incomplete enhancement or pseudo-washout in TP. Slowly enhancing haemangiomas show progressive incomplete enhancement in portal venous phase and TP.
OBJECTIVES: To compare the enhancement patterns and prevalence of pseudo-washout between rapidly and slowly enhancing hepatic haemangiomas on gadoxetate disodium-enhanced MRI in patients with chronic liver disease (CLD) and healthy liver (HL). METHODS: On gadoxetate disodium-enhanced MRI, the extent of intralesional arterial enhancement >50 % and ≤ 50 % of lesions was defined as rapid and slow enhancement, respectively. The enhancement patterns and presence of pseudo-washout during the portal venous phase (PVP) and transitional phase (TP) of 74 hepatic haemangiomas were retrospectively evaluated in the CLD and HL groups. Sequential changes of signal-to-noise ratio (SNR) were measured in unenhanced phase, PVP and TP. RESULTS: Irrespective of hepatic health status, pseudo-washout in TP was significantly more common in the rapidly enhancing haemangiomas (p ≤ 0.026). In both groups, rapidly enhancing haemangiomas showed complete or progressive incomplete enhancement in PVP, which either lasted or transformed to pseudo-washout in TP, whereas slowly enhancing haemangiomas showed progressive incomplete enhancement in PVP and TP. SNR of hepatic parenchyma continued to rise until TP, whereas that of portal vein and haemangioma falls in TP. CONCLUSIONS: Regardless of CLD, pseudo-washout in TP was more common in rapidly than in slowly enhancing haemangiomas, with enhancement patterns differing in the two subgroups. KEY POINTS: On gadoxetate disodium-enhanced MRI, some hepatic haemangiomas show pseudo-washout in transitional phase. Regardless of chronic liver disease, pseudo-washout is significantly more common in rapidly enhancing haemangiomas. Rapidly enhancing haemangiomas show complete or progressive incomplete enhancement or pseudo-washout in TP. Slowly enhancing haemangiomas show progressive incomplete enhancement in portal venous phase and TP.
Entities:
Keywords:
Gadoxetate disodium; Haemangioma; Liver; Magnetic resonance imaging; Pseudo-washout
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